[Rev 02] RFR: Make it possible to only allow PRs against a select set of target branches

[Robin Westberg]

> Hi all,
> 
> Please review this change that makes it possible to only allow PRs to target a select set of branches.
> 
> Best regards,
> Robin

The pull request has been updated with 2 additional commits.

-------------

Added commits:
 - 19779e46: Update bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckRun.java
 - db6743ab: Update bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckRun.java

Changes:
  - all: https://git.openjdk.java.net/skara/pull/377/files
  - new: https://git.openjdk.java.net/skara/pull/377/files/7b261d73..19779e46

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/377/webrev.02
 - incr: https://webrevs.openjdk.java.net/skara/377/webrev.01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/377.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/377/head:pull/377

PR: https://git.openjdk.java.net/skara/pull/377